Traxxas Ford Fiesta ST Rally BL-2s

Stock is as the vehicle ships. Calculated is worked from the stock figures on this page rather than stored beside them, so the two cannot drift apart. Not published means it exists but no source we could find prints it.

Gearing parts

Tooth counts are the ones in the specifications above. Pitch is given as metric module (Mod 1, Mod 0.8) or diametral pitch (32P, 48P). They are different standards and are not interchangeable, even where the numbers look close. Bore is the pinion’s hole, listed separately from the motor shaft (3 mm on the stock motor). Linked part numbers go to the maker's or official distributor's page for that part.

How these numbers were settled

The owner's manual gear chart (p. 24) marks a 13T pinion on the 54T spur as the out-of-box setup at 11.84:1, and the manual gives the formula spur / pinion x 2.85.

• The parts list sets the 13T hardened steel pinion (3943X) and the 54T spur (3956) in regular type as supplied, and both part pages list this car as a stock fitment.
• The product page prints 'Gear Ratio (Internal): 19.69:1', which matches no pinion and spur pair in the chart, so the chart's 11.84 is shown here.
• The spur is described as '0.8 metric pitch, compatible with 32-pitch', so its pitch is left blank.
• The BL-2s ESC takes a 6 or 7 cell NiMH pack or a 2S LiPo.
• Traxxas does not publish a tire diameter for the stock Rally tires on 12-spoke wheels (7473T), so it is left blank.
• Traxxas gives no numeric top speed, only an 'Under 30 mph' class.
• The battery bay is listed as 165 x 50 mm with a height of '23/26 mm', so no single height is shown.

Documents

• ManualOwner's manual, model 74154-4 (Traxxas PDF) (opens in a new tab)Gearing p. 24-25
• Gearing chartGearing compatibility chart, owner's manual (Traxxas PDF) (opens in a new tab)p. 24, out-of-box cell in green
• Parts listParts list, 74154-4 (Traxxas PDF) (opens in a new tab)Spur gears & pinion gears
• Exploded viewExploded view, transmission assembly (Traxxas JPG) (opens in a new tab)

Sources

• ford-fiesta-st-rally-bl-2s-…traxxas.com (opens in a new tab)
• Manual (PDF)traxxas.com (opens in a new tab)
• Manual (PDF)traxxas.com (opens in a new tab)
• 3943x-13-tooth-hd-pinion-ge…traxxas.com (opens in a new tab)
• 3956-54-tooth-spur-gear-32-…traxxas.com (opens in a new tab)
• 3384-bl-2s-brushless-3300-k…traxxas.com (opens in a new tab)
• 7473t-black-12-spoke-rally-…traxxas.com (opens in a new tab)
• 9069-extreme-heavy-duty-12-…traxxas.com (opens in a new tab)

Every figure on this page traces to one of these. Where they disagreed, the note above says which was used and why.

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